.container {
  width: 400px;
  margin: 100px auto;
}

.tools {
  height: 50px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  background-color: #EEE;
  box-sizing: border-box;
  padding: 0 35px;
  border-bottom: 1px dashed #808080;
  font-size: 14px;
  color: #555;
  cursor: pointer;
}

.tools .button:not(:first-child) {
  margin-left: 16px;
}

.tools .button:hover {
  color: #1E90FF;
}

.content {
  width: 400px;
  height: 250px;
  background: #EEE;
  box-sizing: border-box;
  padding: 0 35px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.list:last-child {
  font-size: 26px;
}

.item {
  width: 100px;
  height: 40px;
  background-color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 4px;
  cursor: pointer;
  user-select: none;
  color: #555;
  position: relative;
  z-index: 1;
}

.item:not(:last-child) {
  margin-bottom: 10px;
}

.item.active {
  background: #6495ED;
  color: #FFF;
}

#canvas,
#backCanvas {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}